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Index 121

The VCR converter: 12V to 120V, 20 Watt

Published:2013/5/9 21:07:00 Author:muriel | Keyword: The VCR converter, 12V to 120V, 20 Watt

The VCR converter: 12V to 120V, 20 Watt
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The 8 Watt driver

Published:2013/5/7 22:09:00 Author:muriel | Keyword: The 8 Watt driver

The 8 Watt driver
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The 2 Watt driver

Published:2013/5/7 22:09:00 Author:muriel | Keyword: The 2 Watt driver

The 2 Watt driver
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12 Volt Fluorescent Lamp Drivers

Published:2013/5/7 22:08:00 Author:muriel | Keyword: 12 Volt, Fluorescent Lamp Drivers

12 Volt Fluorescent Lamp Drivers
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12V input, 12V battery charger 2

Published:2013/5/7 22:08:00 Author:muriel | Keyword: 12V input, 12V , battery charger

12V input, 12V battery charger 2
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DC-DC converters

Published:2013/5/7 22:08:00 Author:muriel | Keyword: DC-DC converters

DC-DC converters
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13.8V 20A linear power supply

Published:2013/5/7 22:06:00 Author:muriel | Keyword: 13.8V , 20A , linear power supply

13.8V 20A linear power supply
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Thermostat for room heater

Published:2013/5/7 22:05:00 Author:muriel | Keyword: Thermostat , room heater

Thermostat for room heater
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Resistor Network Solver for the HP-67 Programmable Calculator

Published:2013/5/7 22:05:00 Author:muriel | Keyword: Resistor Network Solver, HP-67 Programmable Calculator

Resistor Network Solver for the HP-67 Programmable Calculator
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Plant watering timer

Published:2013/5/7 22:03:00 Author:muriel | Keyword: Plant watering timer

Plant watering timer
If you are like me, you hate doing the same chores every day, all your life. As much as you can automate such things, you should automate them. One of these chores is watering every plant around my apartment, specially those on the balcony! Long ago I made a small gizmo that takes care of this chore. It also keeps the plants alive when I travel away for one or two months. I simply installed a water hose with a solenoid valve (I used a standard replacement valve for washing machines), and poked thin copper tubes into the hose, leading to each pot. Those plants that require less water get thinner copper tubes. And then I used the following timer circuit to control the valve. Problem solved. The plants are happy. (View)